Sand core Buchner funnel filtration device

The principle of Buchner funnel filtration

Brinell funnel filtration is one of the commonly used laboratory techniques. Its principle is to use a conical funnel with filter paper or filter element at the upper end and a receiving container at the lower end. The mixture to be filtered is placed at the upper end of the funnel, and the solid particles in the mixture are separated by the filtering effect of the filter paper or filter element. The filtrate flows into the receiving container from the lower end of the funnel. When using a Buchner funnel for filtration, it is important to pay attention to some operational techniques. Firstly, it is necessary to choose a suitable filter paper or filter cartridge, usually based on the properties, particle size, and screening requirements of the mixture to be filtered. Secondly, it is necessary to fully wet the filter paper or filter element before use to prevent the filtrate from clogging the surface of the filter paper or filter element, which may affect the filtration effect. Finally, after filtration, it is important to clean the funnel and filter paper or filter element in a timely manner to prevent the filter residue from drying up and affecting the effectiveness of the next use.